W&B date of manufacture?

Got an "AMERICAN RAZOR" by W&B. Scalloped spine, 7/8, faint etch.
http://i658.photobucket.com/albums/u...008WBsmall.jpg

A bit of honewear. It was being used for gutting deer and I rescued it.

The tang stamp does not have the "arrow" nor the crosses.
http://i658.photobucket.com/albums/u...009WBsmall.jpg

Any idea as to approximate dates of manufacture?

1850s-1860s.

http://manah.strazors.com/am_wb_1.jpg

Thank you Sir!

W